<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <tree-table
          class="treeTable"
          :data="cateList"
          :columns="columns"
          :selection-type="false"
          :expand-type="false"
          show-index
          border>
        <template slot="isOK" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false"
             style="color: #55a532"></i>
          <i class="el-icon-error" v-else style="color: #a71d5d"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag type="success" size="mini"
                  v-else-if="scope.row.cat_level === 1">二级
          </el-tag>
          <el-tag type="warning" size="mini" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini"
                     @click="showEditCateDialog(scope.row.cat_id)">编辑
          </el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini"
                     @click="removeCate(scope.row.cat_id)">删除
          </el-button>
        </template>
      </tree-table>
      <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[5, 10, 15, 20]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
      </el-pagination>
      <el-dialog
          title="添加分类"
          :visible.sync="addCateDialogVisible"
          width="50%" @close="addCateDialogClosed">
        <el-form :model="addCateForm"
                 :rules="addCateFormRules"
                 ref="addCateFormRef"
                 label-width="80px">
          <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类">
            <el-cascader
                v-model="selectedKeys"
                :options="parentCateList"
                :props="cascaderProps"
                ref="cascaderRef"
                @change="parentCateChange"
                clearable></el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
      </el-dialog>
      <el-dialog
          title="编辑分类"
          :visible.sync="editCateDialogVisible"
          width="50%"
          @close="editCateDialogClosed">
        <el-form :model="editCateForm"
                 :rules="editCateFormRules"
                 ref="editCateFormRef"
                 label-width="80px">
          <el-form-item label="分类名称" prop="cat_name">
            <el-input v-model="editCateForm.cat_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editCate">确 定</el-button>
        </span>
      </el-dialog>
    </el-card>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 10,
      },
      cateList: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name',
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isOK',
        },
        {
          label: '排序',
          type: 'template',
          template: 'order',
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt',
        },
      ],
      addCateDialogVisible: false,
      editCateDialogVisible: false,
      addCateForm: {
        cat_pid: 0,
        cat_name: '',
        cat_level: 0,
      },
      addCateFormRules: {
        cat_name: [
          {required: true, message: '请输入分类名称', trigger: 'blur'}
        ],
      },
      editCateFormRules: {
        cat_name: [
          {required: true, message: '请输入分类名称', trigger: 'blur'}
        ],
      },
      parentCateList: [],
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
        checkStrictly: true,
      },
      selectedKeys: [],
      editCateForm: {},
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const {data: res} = await this.$http.get('categories', {params: this.queryInfo})
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类列表失败')
      }
      this.cateList = res.data.result
      this.total = res.data.total
      // console.log(this.cateList)
    },
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList() {
      const {data: res} = await this.$http.get('categories', {params: {type: 2}})
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类列表失败')
      }
      this.parentCateList = res.data
    },
    parentCateChange() {
      // console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      // console.log(this.addCateForm)
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加商品分类失败')
        }
        this.$message.success('添加商品分类成功')
        this.addCateDialogVisible = false
        this.getCateList()
      })
    },
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    removeCate(id) {
      this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async () => {
        const {data: res} = await this.$http.delete(`categories/${id}`)
        if (res.meta.status !== 200) return this.$message.error('删除商品分类失败')
        this.$message.success('删除商品分类成功')
        this.getCateList()
      }).catch(() => {
        this.$message.info('取消商品分类删除')
      });
    },
    editCate() {
      this.$refs.editCateFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.put(`categories/${this.editCateForm.cat_id}`,
            {cat_name: this.editCateForm.cat_name})
        if (res.meta.status !== 200) return this.$message.error('更新分类信息失败')
        this.$message.success('更新分类信息成功')
        this.editCateDialogVisible = false
        this.getCateList()
      })
    },
    editCateDialogClosed() {
      this.editCateForm = {}
    },
    async showEditCateDialog(id) {
      const {data: res} = await this.$http.get(`categories/${id}`)
      if (res.meta.status !== 200) return this.$message.error('查询商品分类信息失败')
      this.editCateForm = res.data
      this.editCateDialogVisible = true
    },
  },
  watch: {
    selectedKeys() {
      if (this.$refs.cascaderRef) {
        this.$refs.cascaderRef.dropDownVisible = false
      }
    }
  }
}
</script>

<style scoped>
.treeTable {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}
</style>